Within this section, you can find commonly used units (with conversions from one unit to another) for thermal expansion and density. Fortunately, only a few units are in common use so the content is brief.

Density

The SI unit for density is kilograms per cubic-metre (kg/m³). Another unit commonly used for solid materials is grams per cubic-centimetre (g/cm³). Rarely used units include grams per litre (g/l) and grams per decilitre (g/dl). Conversion between these units is straightforward:

1 kg/m³ = 1 kg/dm³ = 1 kg/l   or  1 g/cm³ = 1 g/ml

As a reference value, the density of water (1000 kg/m³=1 g/cm³) at 3.98 °C and at a pressure of 1013,25 hPa, is often used. For solid materials, densities are most commonly reported in g/cm³ at 20 °C, whereas for gases values are often presented in g/l at 0 °C (at standard ambient pressure).

Thermal Expansion

The SI unit for thermal expansivity is per Kelvin, K^-1, or per degree Celsius, ºC^-1.